Dave Hirschfeld <dave.hirschfeld@...> writes:
>
> It appears that you can't assign an ndarray to a memoryview slice? Is
> this correct/expected behaviour?
>
> Whilst there are a couple of possible workarounds it would be nice if
> this just worked as it's a slightly surprising deviation from the
> ndarray behaviour.
>
> Broken example:
> ```
> In [3]: %%cython
> ...: cimport cython
> ...: import numpy as np
> ...: cimport numpy as np
> ...:
> ...: cpdef np.ndarray[np.float64_t, ndim=2] f():
> ...: cdef np.ndarray[np.float64_t, ndim=2] x = np.ones([3, 4],
> dtype=np.float64)
> ...: cdef double[:,:] y = np.zeros([3, 4], dtype=np.float64)
> ...: cdef np.ndarray[np.float64_t, ndim=1] row
> ...: cdef int idx
> ...: for idx, row in enumerate(x):
> ...: y[idx] = row
> ...: return np.asarray(y)
>
> In [4]: f()
> Traceback (most recent call last):
>
> File "<ipython-input-4-0ec059b9bfe1>", line 1, in <module>
> f()
>
> File "_cython_magic_5f2586693ddbf044815dae01d800bc0c.pyx", line 5,
in
> _cython_magic_5f2586693ddbf044815dae01d800bc0c.f
>
(C:\Users\dhirschfeld\.ipython\cython\_cython_magic_5f2586693ddbf044815d
> ae01d800bc0c.c:2086)
>
> File "_cython_magic_5f2586693ddbf044815dae01d800bc0c.pyx", line 11,
in
> _cython_magic_5f2586693ddbf044815dae01d800bc0c.f
>
(C:\Users\dhirschfeld\.ipython\cython\_cython_magic_5f2586693ddbf044815d
> ae01d800bc0c.c:1935)
> ```
The error which I cutoff above is:
Traceback (most recent call last):
File "<ipython-input-4-0ec059b9bfe1>", line 1, in <module>
f()
File "_cython_magic_5f2586693ddbf044815dae01d800bc0c.pyx", line 5, in
_cython_magic_5f2586693ddbf044815dae01d800bc0c.f
(C:\Users\dhirschfeld\.ipython\cython\_cython_magic_5f2586693ddbf044815d
ae01d800bc0c.c:2086)
File "_cython_magic_5f2586693ddbf044815dae01d800bc0c.pyx", line 11, in
_cython_magic_5f2586693ddbf044815dae01d800bc0c.f
(C:\Users\dhirschfeld\.ipython\cython\_cython_magic_5f2586693ddbf044815d
ae01d800bc0c.c:1935)
TypeError: only length-1 arrays can be converted to Python scalars
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